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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bcc8388cd71d4c742081aeaa8430e3f2d42206847d1a539e9731e142cdd74a' 
  AND token = 'DDPeIJSRu84t2Z4TJFvBQc/MEH2TwPE/a3JDqHAj2lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}